Highly Sensitive Resonance-Enhanced Organic Photodetectors for Shortwave Infrared Sensing
Source abstract
Abstract
Shortwave infrared (SWIR) sensing has various applications, including night vision, remote sensing, and medical imaging. SWIR organic photodetectors (OPDs) offer advantages such as flexibility, cost-effectiveness, and tunable properties; however, lower sensitivity and limited spectral coverage compared to inorganic counterparts are major drawbacks. Here, we propose a simple yet effective and widely applicable strategy to extend the wavelength detection range of the OPD to a longer wavelength, using a resonant optical microcavity. We demonstrate a proof-of-concept in PTB7-Th:COTIC-4F blend system, achieving external quantum efficiency (EQE) > 50% over a broad spectrum (450–1100 nm) with a peak specific detectivity ( D *) of 1.1 × 10 13 Jones at λ = 1100 nm, while speed and linearity are preserved. By employing a small-molecule-acceptor IR6, EQE = 35% and D * = 4.1 × 10 12 Jones are obtained at λ = 1150 nm. This research emphasizes the importance of optical design in optoelectronic devices, proposing a simpler method to broaden the photodetection range compared with traditional approaches using narrow optical gap absorbers.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Luminescence and Fluorescent Materials · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Polymers and Organic Solids, University of California, Santa Barbara 93106, California, United States
Mitsubishi Chemical Center for Advanced Materials, Materials Research Laboratory, University of California, Santa Barbara 93106, California, United States
Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan 21210, Rayong, Thailand
Department of Organic Material Science and Engineering, School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea
Organic Electronics Group, Information & Electronics Technology Center, R&D Division, Specialty Materials Business Group, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Kanagawa, Japan
Funding
Vidyasirimedhi Institute of Science and Technology · University of California, Santa Barbara
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